Just popping in to say: Minnowboard needs 5.5v, not 5v. This seems to have been the cause of my issues. Even with a very beefy 5v supply (8 amps!), board will not come on. On a much wimpier 6v @ 2A source, it powers on fine. I need higher amperage though, because I am driving an HDD on the same source. Ordering a 6v @3A source now.